Abstract:

A fast ionization gauge in a strong magnetic field and noisy environment is developed for

measuring the pressure in the divertor chamber of the HL-2A tokamak. The configuration, the

principles, the design outlines of the fast gauge and the results obtained on the HL-2A tokamak

are described. Without a magnetic field, the N₂ pressure region of the fast gauge is from

6.4×10^-6 to 0.6 Pa,and the ratio of ion current to electron current increases linearly with the

pressure. The highest pressure measured by the fast ionization gauge is 1.5 Pa for H₂ and 4

Pa for He. With magnetic field of 0.6T,the sensitivityof the fastgauge increases by a factorof 3.

The fastgauge has a fasttime response less than 4 ms and has high noise rejection.

Key words: Ionization gauge, Strong magnetic field, Fast time response, High noise rejection

摘要：

研制了一种可工作于强磁场、强干扰环境下的快响应真空电离规(快规)。介绍了快规的结构、

原理、设计梗概和在HL-2A装置偏滤器室中原位测量中性气体压强的实验结果。无磁场时,在

压强1×10^-5~6×10^-1 的范围内,快规的线性度好,H₂压强的测量上限为1.5Pa,He压强的测量上限

为4Pa,覆盖了目前HL-2A装置偏滤器的运行范围;快规处磁感应强度在0.6T左右时,其灵敏度约

提高至无磁场下的3倍。快规的响应时间小于4ms, 并且具有较强的抗干扰能力。

关键词: 电离真空规, 中性气体压强, 快时间响应, 强抗干扰能力